Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 035961f1a73623ca…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:21 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: ed3733bd80399239430c1ccc75181794 SHA-1: 621b1c744993dfd0f68e36f6bf7c61a1f19122f7 SHA-256: 035961f1a73623cade8d74ac5d73512e2b29dac6126aefc5005e7d01e52126f1
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open function. This function is designed to execute automatically when the workbook is opened, indicating an attempt to run arbitrary code. The presence of dangerous formula APIs further suggests malicious intent, likely to download and execute a second-stage payload.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6907 bytes
SHA-256: 7580bce7683d75dbd51f550f3f1c7c0c6f9a4073b8ea3bae608b7081f021c3db
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xnNkhnptcPv
' 0018     26 LABEL : Cell Value, String Constant - abTStvTNtfj len=0 
' 0018     24 LABEL : Cell Value, String Constant - AEpKgKFnL len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G166 
' 0018     25 LABEL : Cell Value, String Constant - EcwJnbLaYW len=0 
' 0018     26 LABEL : Cell Value, String Constant - EJuVcEtTGSX len=0 
' 0018     24 LABEL : Cell Value, String Constant - fcGPGSoFs len=0 
' 0018     27 LABEL : Cell Value, String Constant - HKbeUUPnuDCM len=0 
' 0018     24 LABEL : Cell Value, String Constant - IMrBunAxm len=0 
' 0018     25 LABEL : Cell Value, String Constant - kzEEcwvaYH len=0 
' 0018     24 LABEL : Cell Value, String Constant - LOXEvVMLK len=0 
' 0018     26 LABEL : Cell Value, String Constant - lTmZObFPton len=0 
' 0018     24 LABEL : Cell Value, String Constant - odZHcgneD len=0 
' 0018     25 LABEL : Cell Value, String Constant - OfrDMIYmzQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - PDymp len=0 
' 0018     23 LABEL : Cell Value, String Constant - rOoRmPyN len=0 
' 0018     26 LABEL : Cell Value, String Constant - umcANIVQQFz len=0 
' 0018     21 LABEL : Cell Value, String Constant - WQisHa len=0 
' 0018     23 LABEL : Cell Value, String Constant - WTEfTwTS len=0 
' 0018     21 LABEL : Cell Value, String Constant - wuhKbh len=0 
' 0018     24 LABEL : Cell Value, String Constant - XFyfPoFHd len=0 
' 0018     24 LABEL : Cell Value, String Constant - yrmZwqdhf len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constan
... (truncated)

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